ZWITTERION
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Amino acids have amine (-NH2) and
carboxylic acid (-COOH) functional groups and have an R (a side chain
hydrocarbon).
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In an amino acid, when the carboxylic acid group
loses H+ ion and amine group gains H+ ion, a zwitterion is formed. Zwitterion
contains COO- group and NH3+ group.
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Zwitterion have both positive and negative
charges, and hence neutral.
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Zwitterions are sometimes are also called ‘inner
salts’.
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